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Permanent of the product of doubly stochastic matrices

Published online by Cambridge University Press:  24 October 2008

R. A. Brualdi
R. A. Brualdi
Affiliation:
University of Wisconsin
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Extract

If A = [aij] is an n × n matrix, the permanent of A is the scalar valued function of A defined by

where the summation extends over all permutations (i1, i2, …, in) of the integers 1, 2, …, n. If we assume that A is a non-negative matrix (that is, that A has non-negative entries) then we come upon an extremely interesting situation. Much work has been done in finding significant upper bounds for the permanent and permanental minors of A (see, e.g. (2, 4–7) in (5) an excellent bibliography is given). If B = [bij] is another n × n non-negative matrix, then we may form the product AB and consider the permanent of this matrix. Unlike the determinant, the permanent is not a multiplicative function. In our circumstances here, however, it is easy to verify and indeed a proof was written down in (1) that

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 62 , Issue 4 , October 1966 , pp. 643 - 648
Copyright
Copyright © Cambridge Philosophical Society 1966

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References

REFERENCES

(1)Brualdi, R. A.Permanent of the direct product of matrices. Pacific J. Math. 16 (1966), 471–482.CrossRefGoogle Scholar
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